Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc-cloned / deps / grpc / src / core / lib / gprpp / global_config_env.h

diff --git a/legacy-libs/grpc-cloned/deps/grpc/src/core/lib/gprpp/global_config_env.h b/legacy-libs/grpc-cloned/deps/grpc/src/core/lib/gprpp/global_config_env.h
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+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_LIB_GPRPP_GLOBAL_CONFIG_ENV_H
+#define GRPC_CORE_LIB_GPRPP_GLOBAL_CONFIG_ENV_H
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/gprpp/global_config_generic.h"
+#include "src/core/lib/gprpp/memory.h"
+
+namespace grpc_core {
+
+typedef void (*GlobalConfigEnvErrorFunctionType)(const char* error_message);
+
+/*
+ * Set global_config_env_error_function which is called when config system
+ * encounters errors such as parsing error. What the default function does
+ * is logging error message.
+ */
+void SetGlobalConfigEnvErrorFunction(GlobalConfigEnvErrorFunctionType func);
+
+// Base class for all classes to access environment variables.
+class GlobalConfigEnv {
+ protected:
+  // `name` should be writable and alive after constructor is called.
+  constexpr explicit GlobalConfigEnv(char* name) : name_(name) {}
+
+ public:
+  // Returns the value of `name` variable.
+  UniquePtr<char> GetValue();
+
+  // Sets the value of `name` variable.
+  void SetValue(const char* value);
+
+  // Unsets `name` variable.
+  void Unset();
+
+ protected:
+  char* GetName();
+
+ private:
+  char* name_;
+};
+
+class GlobalConfigEnvBool : public GlobalConfigEnv {
+ public:
+  constexpr GlobalConfigEnvBool(char* name, bool default_value)
+      : GlobalConfigEnv(name), default_value_(default_value) {}
+
+  bool Get();
+  void Set(bool value);
+
+ private:
+  bool default_value_;
+};
+
+class GlobalConfigEnvInt32 : public GlobalConfigEnv {
+ public:
+  constexpr GlobalConfigEnvInt32(char* name, int32_t default_value)
+      : GlobalConfigEnv(name), default_value_(default_value) {}
+
+  int32_t Get();
+  void Set(int32_t value);
+
+ private:
+  int32_t default_value_;
+};
+
+class GlobalConfigEnvString : public GlobalConfigEnv {
+ public:
+  constexpr GlobalConfigEnvString(char* name, const char* default_value)
+      : GlobalConfigEnv(name), default_value_(default_value) {}
+
+  UniquePtr<char> Get();
+  void Set(const char* value);
+
+ private:
+  const char* default_value_;
+};
+
+}  // namespace grpc_core
+
+// Macros for defining global config instances using environment variables.
+// This defines a GlobalConfig*Type* instance with arguments for
+// mutable variable name and default value.
+// Mutable name (g_env_str_##name) is here for having an array
+// for the canonical name without dynamic allocation.
+// `help` argument is ignored for this implementation.
+
+#define GPR_GLOBAL_CONFIG_DEFINE_BOOL(name, default_value, help)         \
+  static char g_env_str_##name[] = #name;                                \
+  static ::grpc_core::GlobalConfigEnvBool g_env_##name(g_env_str_##name, \
+                                                       default_value);   \
+  bool gpr_global_config_get_##name() { return g_env_##name.Get(); }     \
+  void gpr_global_config_set_##name(bool value) { g_env_##name.Set(value); }
+
+#define GPR_GLOBAL_CONFIG_DEFINE_INT32(name, default_value, help)         \
+  static char g_env_str_##name[] = #name;                                 \
+  static ::grpc_core::GlobalConfigEnvInt32 g_env_##name(g_env_str_##name, \
+                                                        default_value);   \
+  int32_t gpr_global_config_get_##name() { return g_env_##name.Get(); }   \
+  void gpr_global_config_set_##name(int32_t value) { g_env_##name.Set(value); }
+
+#define GPR_GLOBAL_CONFIG_DEFINE_STRING(name, default_value, help)         \
+  static char g_env_str_##name[] = #name;                                  \
+  static ::grpc_core::GlobalConfigEnvString g_env_##name(g_env_str_##name, \
+                                                         default_value);   \
+  ::grpc_core::UniquePtr<char> gpr_global_config_get_##name() {            \
+    return g_env_##name.Get();                                             \
+  }                                                                        \
+  void gpr_global_config_set_##name(const char* value) {                   \
+    g_env_##name.Set(value);                                               \
+  }
+
+#endif /* GRPC_CORE_LIB_GPRPP_GLOBAL_CONFIG_ENV_H */